Once the bones are removed from the rock they can be assembled into a miniature version of a Stegosaurus. This set includes a plaster "rock" with skeleton and a special digging tool to excavate the bones. Manufacturered by BIUYYY. Learn the different bone structures of dinosaurs. Recommended for ages 4 years and up. This stegosaurus skeleton dig kit allows junior paleontologists to experience the fun of excavating a dinosaur skeleton.